Polypropylene composition supporting laser marking and preparation method and application thereof

Abstract

The invention discloses a polypropylene composition supporting laser marking and a preparation method and an application thereof. The polypropylene composition comprises the following components in percentage by mass: 40-80 percent of polypropylene resin, 5-30 percent of an elastomer, 0-40 percent of an inorganic filler, 0.01-5 percent of a marking agent and 0.01-5 percent of a white toner. The preparation method comprises the following steps of: proportionally mixing the components; melting, blending and extruding by using an extruder; performing water cooling and bracing; and pelletizing. Due to the adoption of the marking agent and the prepared polypropylene composition supporting laser marking, a clear deep-color mark can be formed under a light color background under the condition of a small adding amount of the marking agent, the mark is firm and durable and does not disappear due to mechanical, chemical and physical factors, the cost is relatively low, and the use requirements of plastic parts in the industries of automobiles, home appliances, IT (Internet Technology), office equipment, electric tools, packages and the like can be fully met.

Description

technical field [0001] The invention relates to a polypropylene composition, especially a laser-markable polypropylene composition, its preparation method and application. Background technique [0002] Polypropylene is widely used in industries such as automobiles, home appliances, machinery and packaging because of its light weight, solvent resistance, easy processing, and easy recycling. In recent years, with the rapid development of various industries, the consumption of polypropylene is also increasing year by year. In practical applications, polypropylene products are often required to be marked on their surface to improve their recognizability and traceability. The traditional marking method mainly uses inkjet coding technology, but the marks obtained by this method are often easy to fade or disappear, and the use of ink will also cause pollution to the environment. [0003] In recent years, laser marking technology has been more and more widely used in the marking o...

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Problems solved by technology

[0004] Although laser marking has the above advantages, its application also has limitations. For example, polyolefin is a polymer that is difficult or even impossible to laser mark.

In addition, even if it is the same polymer, its laser marking performance is also very different due to different colors. For example, Chinese patent CN200910065221.6 discloses a plastic laser marking functional masterbatch, which is composed of photosensitizer, white pigment, black pigment , organic polymer carrier, which can produce clear white patterns or writing on the surface of black pp plastics, but it is difficult to make ideal dark patterns and traces on light-colored polypropylene, because it cannot effectively absorb the corresponding wavelength laser to convert light energy into heat energy

In addition, the amount of marking agent added is large, which affects the performance of the material and is relatively expensive

At present, there is no research report on the laser marking performance of light-colored polypropylene in domestic and foreign literature and patents.

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